By the simplest syntax for creating a view, the table column drop will fail as. The command can be used in different ways depending on the specific requirement of the user. Unlike PostgreSQL, Redshift does not support the sequence object type. Problem/Issue: I have 600 tables already created (with no data) and does not make sense to open each table and note the datatype for a particular column and use it in my ALTER TABLE query to apply NOT NULL constraint. The ALTER TABLE ALTER COLUMN SET NOT NULL command is used to modify an existing column in the table in Redshift to set the NOT NULL constraint. Hence, the statement ALTER TABLE "" ALTER ("" VARCHAR (256) NOT NULL) works. This does not work since the datatype for the column name is missing. I am good with the Primary Key.įor applying NOT NULL constraint, I am using the following statement - ALTER TABLE "" ALTER ("" NOT NULL). Prepare Table & Data Let’s create a Redshift table with a few columns. Now I would need to apply Primary Key and NOT NULL constraints on the columns of these tables. As you can see, the above table contains null values in orderdate and amount columns. Scenario: I have created 600 tables in SAP HANA. Logically its a very simple thing that I intend to achieve.
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